<?php

/*
 * Copyright 2008 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#namespace tehframework\mvc;

#use tehframework\request\Request;
#use tehframework\response\Response;

abstract class ControllerBase implements Controller
{
	/**
	 * @var EventHandler
	 */
	public $preExecute;
	
	/**
	 * @var EventHandler
	 */
	public $postExecute;
	
	/**
	 * @param  Request $request
	 * @param  Response $response
	 * @return ModelAndView
	 * @throws Exception
	 */
	abstract protected function execute(
		Request $request, Response $response);
	
	/**
	 * @param  Request $request
	 * @param  Response $response
	 * @return ModelAndView
	 * @throws Exception
	 */
	public function handle(Request $request, Response $response)
	{
		$e = new ControllerExecutionEventArgs($request, $response);
		
		$this->onPreExecute($e);
		
		$mav = $e->isHandled()
			? $e->getResult() : $this->execute($request, $response);
		
		$e = new ControllerExecutionEventArgs($request, $response, $mav);
		
		$this->onPostExecute($e);
		
		return $e->getResult();
	}
	
	/**
	 * @param  ControllerExecutionEventArgs $e
	 */
	protected function onPreExecute(ControllerExecutionEventArgs $e)
	{
		if (count($this->preExecute))
		{
			$this->preExecute->fireEvent($this, $e);
		}
	}
	
	/**
	 * @param  ControllerExecutionEventArgs $e
	 */
	protected function onPostExecute(ControllerExecutionEventArgs $e)
	{
		if (count($this->postExecute))
		{
			$this->postExecute->fireEvent($this, $e);
		}
	}
}